Half to john w



(No Model.) 2 sheets sheet 1. I G. E. MILLER.

RECESSING TOOL FOR LATHES. NoQ 605,184. Patented June 7,1898.

a 1 i a W/TNESSES" lNVENTOH y fl/r/ry ATTORNEY.

(No Model.) 2 SheetsShe et 2.-

" G. E. MILLER.

REGESSING TGOL FOR LATHES.

No; 605,184. Patented June 7, 1898.

lowing to be a full, clear, and exact descrip- NIED STATES GEORGE E.MILLER, OF MIDDLETOIVN, PENNSYLVANIA, ASSIGNOR OF ONE- HALF TO JOHN \V.ALBRIGI-IT, OF SAME PLACE.

RECESSlNG-TOOL FOR LATHES.

SPECIFICATION forming part of Letters Patent No; 605,184, dated June '7,1898.

A li ti filed December 18, 1896 T0 ctZZ whom it may concern:

Be it known that I, GEORGE E. MILLER, a citizen of the United States,residing at Middletown, in the county of Dauphin and State ofPennsylvania, have invented certain new and useful Improvements inRecessing-Tools for Lathes; and I do hereby declare the foltion of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

My invention relates to recessing-tools for lathes.

My object is to provide a novel form of reeessing device adapted to becarried bya tap of the expanding type, so that in tapping and recessingcouplings or similar pieces of work the two operations of tapping orthreading and recessing may be carried on simultaneously, thereby savingmuch time and labor. Ordinarily the tapping or threading of the couplingis first accomplished, and then the recessing and facing are done with aseparate device fed up by hand. My improved device, describedhereinafter, does away with the necessity of two operations.

Having this and other minor objects in View, the invention consists ofcertain improved features and novel combinations of parts appearing morefully hereinafter.

In the accompanying drawings, Figure l is a side elevation showing thetap and toolholder; Fig. 2, a detail plan view of said toolholder; Fig.3, a rear view of the tap, disclosing the tool-post; Fig. 4, across-section of the same, and Fig. 5 a detail plan view of atool-holding cutter.

Referring now to the devices disclosed in Figs. 1 and 2, the numeral 1designates an expanding-tap of ordinary construction, which has themovable threaded cutter-bars 2. Reference being had to Figs. 3 and 4:,it Will be seen that the tap is provided with a pocket 3 of rectangularshape.

The numeral 4 designates a tool-post, having a tenon 5 adapted to snuglyfit within the pocket.

The numeral 6 represents a diagonally-disposed screw which secures thetenon in the pocket. This tool-post has a slot 7, S representing aclamping-screw which passes down Serial No. 616,180. (No model.)

through the tool-post into the slot. The toolpost can be made to holdone or more tools, and in the present instance two are shown, they beingdesignated by the numerals 9 and 10. The tool 10 serves as arecessing-tool and projects toward the free end of the tap farther thanthe tool 9, which acts as a facingtool for the coupling or other piecebeing acted on.

In Figs. 1 and 2 I have shown a tool-holder adapted to contain a numberof tools. This is designated by the numeral 11, and it is secured byscrews 12 to the rear end of the tap and the arbor of the latter. Saidtool-holder has a number of posts 13, each having a slot 14.

The numerals 15 designate clamping-screws provided for each post, and itwill be seen that a number of tools can be used. If desirable,additional pins 16 could be employed to secure the holder in position.

My improved cutter is shown in detail in Fig. 5. This cutter is slippedover the tap, and it is designated by the numeral 17, the cutting -teeththereof being shown at 18. There are a series of radial slots 19,leadingfrom the inner edge of the cutter outward in line with thehighest points of the teeth. Clamping-screws 20, passing through the in-8Q clined faces of the teeth, serve to hold the out ter on the tap,While additional clampingscrews 21 pass through the teeth and projectinto the slots, being adapted to secure the recessing-tools in saidslots and against the face of the tap. It is obvious that it isnecessary to remove the tool-post 4 before the cutter can be slipped onthe tap. As many of the tools can be placed in the openings 19 of thecutter as desirable. The cutter can then be used as a facing-tool. Ofcourse the clamping-screws 21 cannot be used when the cutter itself isemployed to recess, although they remain in position when the cutter isonly used for facing. The coupling to be threaded 5 and recessed isgripped in the carriage, (which, being swiveled, is adaptedto turnhorizontally in a complete circle,) and the tap is held in a chuck orwedged in the spindle of the lathe head-stock.

carriage will advance by itself.

Thecarriage is fed I00 ters in the coupling and t reads the same. Therecessing-tool next 0 mes up and recesses the coupling, and thefacing-tool finally faces off the outer end of the coupling, theseoperations being carried on at the same time. Of course it is necessaryto separate the recessing and facing tools the distance that it isdesired to recess the coupling. After these operations have beencompleted, the coupling being threaded from one end to its center, thetap is contracted, so that the thread-cutter bars are withdrawn from thethreads made in the coupling and the carriage is moved back. The swivelportion of the carriage is then turned so as to present the other end ofthe coupling, and the operation before described may then be repeated.

It will be seen that much time and labor are saved in using my improveddevices, as the operations are carried on simultaneously.

Inasmuch as the depth between the recessing and facing tools and thedistance between the point of the thread-cutting bars and said toolsremain constant after thedevice has been adjusted all the couplings willbe turned out similar. If itis desired to make a longer coupling, thetools can be adjusted backward, and if a smaller coupling is wanted theycan be adjusted forward.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a recessing-tool, the combination with a tap having a recess, orpocket, of a toolholder carried thereby provided with a tenon engagingsaid recess or pocket and with a tool slot or opening,independently-adjustable recessing and facing tools superposed one inrelation to the other and in diametrical relation to the tap in saidopening, and a clampingscrew passing through the toolholder and bindingon said tools.

2. In a recessing-tool, the combination with a tap, of a tool holder orpost having a portion received in said tap, a screw whose shank passesthrough the tap and into the post and is adapted for holding the latterin position, and a tool secured in said tool-holder.

3. In a recessing-tool, the combination with a tap provided with arecess, of a tool holder or post having a reduced portion which fits insaid recess and said post extending diametrically in relation to the tapand provided with an opening, an inclined screw whose shank passesthrough the tap and into the reduced portion of the post, independentrecessing and facing tools located in the holder, and a clamping-screwthreaded into the said post or holder and binding on the tools.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

GEORGE E. MILLER.

Witnesses:

JOHN W. ALBRIGHT, SAMUEL MILLER.

